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update profiling doc

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Carter Anderson 2020-06-10 00:24:28 -07:00
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docs/profiling.md
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# Profiling
* Compile Times: append ```-Ztimings``` to cargo builds
* Runtime Flame Graph: ```cargo flamegraph --example EXAMPLE_NAME```
* Runtime Flame Graph:
* Flat-ish: ```RUSTFLAGS='-C force-frame-pointers=y' cargo flamegraph --example EXAMPLE_NAME```
* Graph: ```RUSTFLAGS='-C force-frame-pointers=y' cargo flamegraph -c "record -g" --example EXAMPLE_NAME```
* built on top of perf, no instrumentation required
* Runtime Instrumentation:
* https://github.com/glennw/thread_profiler